Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Instruments Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	$ 23,010	$ 68,900
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	23,010	68,900
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(9,888)	(44,902)
Fair value of derivative assets, Net	13,122	23,998
Fair value of derivative liabilities, Gross Amounts	19,442	79,925
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	19,442	79,925
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(9,888)	(44,902)
Fair value of derivative liabilities, Net	9,554	35,023
Additional netting benefit [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(4,850)	(9,512)
Fair value of derivative assets, Net	(4,850)	(9,512)
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(4,850)	(9,512)
Fair value of derivative liabilities, Net	(4,850)	(9,512)
Designated as hedging instruments [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	11,965
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	11,965
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(4,984)
Fair value of derivative assets, Net	6,981
Fair value of derivative liabilities, Gross Amounts	10,325	813
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	10,325	813
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(4,984)	(813)
Fair value of derivative liabilities, Net	5,341	0
Designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
Derivative [Line Items]
Fair value of derivative liabilities, Gross Amounts		813
Fair value of derivative liabilities, Gross amounts offset in the balance sheet		0
Fair value of derivative liabilities, Net amounts		813
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet		(813)
Designated as hedging instruments [Member] \| Foreign currency forward contracts [Member] \| Cash flow hedges [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	11,965
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	11,965
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(4,984)
Fair value of derivative assets, Net	6,981
Fair value of derivative liabilities, Gross Amounts	6,762
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0
Fair value of derivative liabilities, Net amounts	6,762
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(4,984)
Fair value of derivative liabilities, Net	1,778
Designated as hedging instruments [Member] \| Foreign currency forward contracts [Member] \| Net Investment Hedges [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	0
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	0
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0
Fair value of derivative assets, Net	0
Fair value of derivative liabilities, Gross Amounts	3,563
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0
Fair value of derivative liabilities, Net amounts	3,563
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0
Fair value of derivative liabilities, Net	3,563
Designated as hedging instruments [Member] \| Foreign currency forward and option contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts		16,027
Fair value of derivative assets, Gross amounts offset in the balance sheet		0
Fair value of derivative assets, Net amounts		16,027
Fair value of derivative assets, Gross amounts not offset in the balance sheet		(813)
Fair value of derivative assets, Net		15,214
Not designated as hedging instruments [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	11,045	52,873
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	11,045	52,873
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(54)	(34,577)
Fair value of derivative assets, Net	10,991	18,296
Fair value of derivative liabilities, Gross Amounts	9,117	79,112
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	9,117	79,112
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(54)	(34,577)
Fair value of derivative liabilities, Net	9,063	44,535
Not designated as hedging instruments [Member] \| Foreign currency forward contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts		43,203
Fair value of derivative assets, Gross amounts offset in the balance sheet		0
Fair value of derivative assets, Net amounts		43,203
Fair value of derivative assets, Gross amounts not offset in the balance sheet		(34,577)
Fair value of derivative assets, Net		8,626
Not designated as hedging instruments [Member] \| Embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	5,871	8,926
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	5,871	8,926
Fair value of derivative assets, Gross amounts not offset in the balance sheet	0
Fair value of derivative assets, Net	5,871	8,926
Fair value of derivative liabilities, Gross Amounts	4,978	1,772
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	4,978	1,772
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	0
Fair value of derivative liabilities, Net	4,978	1,772
Not designated as hedging instruments [Member] \| Economic hedges of embedded derivatives [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	2,035	744
Fair value of derivative assets, Gross amounts offset in the balance sheet	0	0
Fair value of derivative assets, Net amounts	2,035	744
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(4)
Fair value of derivative assets, Net	2,031	744
Fair value of derivative liabilities, Gross Amounts	32	417
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	32	417
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(4)
Fair value of derivative liabilities, Net	28	417
Not designated as hedging instruments [Member] \| Foreign currency forward and option contracts [Member]
Derivative [Line Items]
Fair value of derivative assets, Gross Amounts	3,139
Fair value of derivative assets, Gross amounts offset in the balance sheet	0
Fair value of derivative assets, Net amounts	3,139
Fair value of derivative assets, Gross amounts not offset in the balance sheet	(50)
Fair value of derivative assets, Net	3,089
Fair value of derivative liabilities, Gross Amounts	4,107	76,923
Fair value of derivative liabilities, Gross amounts offset in the balance sheet	0	0
Fair value of derivative liabilities, Net amounts	4,107	76,923
Fair value of derivative liabilities, Gross amounts not offset in the balance sheet	(50)	(34,577)
Fair value of derivative liabilities, Net	$ 4,057	$ 42,346

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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